Relevant bibliographies by topics / Angle de tilt

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Angle de tilt'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 May 2024

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Journal articles on the topic "Angle de tilt"

1

Manjunath, Pramod, D. Devaprakasam, and Dipen Paul. "Estimation of Global Solar Radiation and Optimal Tilt Angles of Solar Panels for Pune, India." International Journal of Design & Nature and Ecodynamics 16, no. 1 (February 28, 2021): 85–90. http://dx.doi.org/10.18280/ijdne.160111.

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Solar panels can achieve the highest yield when they are oriented in the right way as the influence of the tilt angles can lead to a high impact on the performance. This paper demonstrates the effect of the tilt angle on the final yield and maximum utilization of solar energy. The annual optimal tilt angle of the solar panels for Pune was found out using the Liu and Jordan model. The optimal tilts yielding an increase of 7% was found out to be 0° on the months starting from April and lasting till September and 40° starting from October and holding at 40° till March. By changing the tilt angle every month, there was an increase in the yield by more than 8%. For better yield and maximum utilization of solar energy, optimizing the tilt angles of solar panels monthly or even twice a year is effective based on the study. Most of the panels are fixed at an angle equal to the latitude of the place and oriented towards the Southern sky in the northern hemisphere. Measurements of the monthly average global solar radiation, monthly average temperatures, and monthly average relative humidity were compared. Further ahead regression correlation for a linear model was carried and the regression coefficients a and b were found out to be 0.2804 and 0.3618 respectively.
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Aljanabi, Mohanad, Muhammed Salah Sadiq Al-Kafaji, and Ahmed Hussein Duhis. "Optimum yearly and seasonal tilt angle of solar system in the center of Babylon/Iraq using PVsyst software." Indonesian Journal of Electrical Engineering and Computer Science 31, no. 2 (August 1, 2023): 626. http://dx.doi.org/10.11591/ijeecs.v31.i2.pp626-635.

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The photovoltaic system tilt angle is one of the more significant factors for obtaining the maximum solar energy that will fall on the PV panel. Consequently, then obtain maximum power output, the solar array needs to be angled properly. The analysis for a stand-alone system is simulated and modelled using PVsyst software version-7.2 for system power 3,120 Wp to obtain the optimum value of the tilt angles of maximum solar irradiation in the center of Babylon Governorate, Iraq. The ideal tilt angle for the south has been found for both yearly and the seasons. Different tilt angles were taken which were (29°, 30°, and 31°) annually, azimuth angle for all is (0°). The incident global irradiation in the collector plane, Incident beam irradiation in the collector plane is maximum at tilt angle (29°) that produces maximum available energy 5,132 kWh/kWp/year. same processing for annual different tilt angle was taken for seasonally; the results show that the angle (49°) for summer and (13°) for winter are the optimum tilt angle which obtains the maximum incident global irradiation in the collector plane, maximum incident beam irradiation in the collector plane at this angle then product maximum available energy 5,343 kWh/kWp/year.
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Soulayman, S., and W. Sabbagh. "Optimum Tilt Angle at Tropical Region." International Journal of Renewable Energy Development 4, no. 1 (February 15, 2015): 48–54. http://dx.doi.org/10.14710/ijred.4.1.48-54.

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: One of the important parameters that affect the performance of a solar collector is its tilt angle with the horizon. This is because of the variation of tilt angle changes the amount of solar radiation reaching the collector surface. Meanwhile, is the rule of thumb, which says that solar collector Equator facing position is the best, is valid for tropical region? Thus, it is required to determine the optimum tilt as for Equator facing and for Pole oriented collectors. In addition, the question that may arise: how many times is reasonable for adjusting collector tilt angle for a definite value of surface azimuth angle? A mathematical model was used for estimating the solar radiation on a tilted surface, and to determine the optimum tilt angle and orientation (surface azimuth angle) for the solar collector at any latitude. This model was applied for determining optimum tilt angle and orientation in the tropical zones, on a daily basis, as well as for a specific period. The optimum angle was computed by searching for the values for which the radiation on the collector surface is a maximum for a particular day or a specific period. The results reveal that changing the tilt angle 12 times in a year (i.e. using the monthly optimum tilt angle) maintains approximately the total amount of solar radiation near the maximum value that is found by changing the tilt angle daily to its optimum value. This achieves a yearly gain in solar radiation of 11% to 18% more than the case of a solar collector fixed on a horizontal surface.
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Jiao, Qirong, Jie Jiang, and Zi-Fan Wang. "Sunspot tilt angles revisited: Dependence on the solar cycle strength." Astronomy & Astrophysics 653 (September 2021): A27. http://dx.doi.org/10.1051/0004-6361/202141215.

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Context. The tilt angle of sunspot groups is crucial in the Babcock-Leighton (BL) type dynamo for the generation of the poloidal magnetic field. Some studies have shown that the tilt coefficient, which excludes the latitudinal dependence of the tilt angles, is anti-correlated with the cycle strength. If the anti-correlation exists, it will be shown to act as an effective nonlinearity of the BL-type dynamo to modulate the solar cycle. However, some studies have shown that the anti-correlation has no statistical significance. Aims. We aim to investigate the causes behind the controversial results of tilt angle studies and to establish whether the tilt coefficient is indeed anti-correlated with the cycle strength. Methods. We first analyzed the tilt angles from Debrecen Photoheliographic Database (DPD). Based on the methods applied in previous studies, we took two criteria (with or without angular separation constraint Δs > 2.​​°5) to select the data, along with the linear and square-root functions to describe Joy’s law, and three methods (normalization, binned fitting, and unbinned fitting) to derive the tilt coefficients for cycles 21–24. This allowed us to evaluate different methods based on comparisons of the differences among the tilt coefficients and the tilt coefficient uncertainties. Then we utilized Monte Carlo experiments to verify the results. Finally, we extended these methods to analyze the separate hemispheric DPD data and the tilt angle data from Kodaikanal and Mount Wilson. Results. The tilt angles exhibit an extremely wide scatter due to both the intrinsic mechanism for its generation and measurement errors, for instance, the unipolar regions included in data sets. Different methods to deal with the uncertainties are mainly responsible for the controversial character of the previous results. The linear fit to the tilt-latitude relation of sunspot groups with Δs > 2.​​°5 of a cycle carried out without binning the data can minimize the effect of the tilt scatter on the uncertainty of the tilt coefficient. Based on this method the tilt angle coefficient is anti-correlated with the cycle strength with strong statistical significance (r = −0.85 at 99% confidence level). Furthermore, we find that tilts tend to be more saturated at high latitudes for stronger cycles. The tilts tend to show a linear dependence on the latitudes for weak cycles and a square-root dependence for strong cycles. Conclusions. This study disentangles the cycle dependence of sunspot group tilt angles from the previous results that were shown to be controversial, spurring confusion in the field.
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Howard, Robert F. "The Development of Sunspot Groups." International Astronomical Union Colloquium 141 (1993): 492–94. http://dx.doi.org/10.1017/s0252921100029699.

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AbstractIt is shown that the growth and decay rates of sunspot groups are both a function of the axial tilt angles of the groups. Both of these rates reach a maximum near the average tilt angle, which is around +5°, not 0°. (A positive tilt angle represents the situation where the leading spots are equatorward of the following spots). The fact that this peak angle is close to the average tilt and not 0° suggests that this may be the orientation of the subsurface toroidal flux tube(s) from which the sunspot groups form. In general, spot groups with positive tilt angles show faster average percentage growth rates for greater positive tilt angles. For negative tilt angles (following spots equatorward of leading spots) the situation is quite different. Within certain well-defined ranges of tilt angles the average group percentage area growth rates are quite high and the dispersion in this quantity is large. In other well-defined tilt angle ranges the percentage growth rates are uniformly (relatively) small. The difference between these average growth rates is more than a factor two. The reality of this result can be demonstrated by selecting for analysis various subsets of the data. It may be hypothesized that in general the dispersion measured in group tilt angles results from the random action of large-scale convection on the rising magnetic flux loops. Both growth and decay are facilitated in the case of flux loops that have a minimum twist. The percentage growth and decay rates are affected by the fact that groups with tilt angles near the average value tend to be larger than groups with different tilt angles. The ‘quantized’ behavior of the percentage growth rates for negative tilt angles is difficult to fit into any rough model of flux emergence. The more or less ‘quantized’ nature of the growth-tilt angle relationship for negative tilt angles is quite puzzling and may reflect some characteristic of the subsurface flux orientation or development which is at present unknown.
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Hassanian, Reza, Morris Riedel, Nashmin Yeganeh, and Runar Unnthorsson. "A Practical Approach for Estimating the Optimum Tilt Angle of a Photovoltaic Panel for a Long Period—Experimental Recorded Data." Solar 1, no. 1 (November 24, 2021): 41–51. http://dx.doi.org/10.3390/solar1010005.

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In this study, recorded empirical data were applied with a practical approach to investigate the optimal tilt angle of the flat plate collectors facing south for a long period in Tehran, Iran. The data included 20 years of recorded average total radiation on the horizontal plane in Tehran’s meteorological station. Based on the previous studies, the annual optimum tilt angle for Tehran was estimated at 33 degrees annually; however, this estimation does not focus on the energy absorption and effectiveness of changing the tilt angle monthly, seasonally, and bi-annually via measured data. This paper aims to explain this distinction between various radiation receptions with different tilt angle adjustments. This study shows that annual solar cumulative radiation energy gained via a monthly tilt angle can be approximately 7% higher than that achieved with an annual tilt angle setup. Additionally, the seasonal and bi-annual tilt angles have about 6% more annual cumulative radiation absorption than the annual tilt angle setup. Moreover, with consideration of similar monthly received radiation, the results illustrate that the radiation gained with a monthly tilt angle set up was 20% greater in the summer months than an annual tilt angle adjustment.
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Chauhan, Ranchan, N. S. Thakur, and Sunil Chamoli. "Tilt Angle Optimization for Grid Interactive Solar Photovoltaic Array." Applied Mechanics and Materials 110-116 (October 2011): 4554–58. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.4554.

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The overall performance of any solar energy project largely depends upon the available solar radiations, inclination and orientation of solar collectors. Presented in this paper is the analytical study on optimum tilt angles and lifetime differential savings for a distributed 200 kW grid connected mono-crystalline solar PV system operating at Khatkar Kalan, Punjab, India. The optimum tilt angles for monthly, seasonally and yearly basis is carried out by searching the values of tilt angle for which electric power output is maximum for a particular day or a specific period using energy conversion model. The results reveal that the yearly optimum tilt angle for the SPV plant at Khatkar Kalan is 36° which is 4.58° higher than the latitude angle. The power output from the array increases with increase in angle of tilt for winter months whereas the trend is reverse for the summer months. In winter months the maximum power output is achieved for the array surface with a tilt of angle 13° - 23° higher than the local latitude while for summer months the maximum power output is achieved at 16° lower than the latitude angle. The optimum tilt angles maximizing monthly power output for south facing surface shows that the monthly optimum tilt angle varies from 15° to 55°. Also the parametric analysis for some influential factors such as latitude of location and reflectivity of ground surface is explored.
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Memon, Qasir Ali, Abdul Qadir Rahimoon, Khurshed Ali, Muhammad Fawad Shaikh, and Shoaib Ahmed Shaikh. "Determining Optimum Tilt Angle for 1 MW Photovoltaic System at Sukkur, Pakistan." International Journal of Photoenergy 2021 (May 21, 2021): 1–8. http://dx.doi.org/10.1155/2021/5552637.

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Solar energy is directly converted into electrical energy by using photovoltaic (PV) panels. The efficiency of PV panel varies with its orientation and tilt angle with the horizontal plane. In this paper, we investigate the optimum tilt angle of solar panels installed at Sukkur IBA University. The optimum angle for tilted surfaces varying from 0° to 90° in steps of 1° was calculated for the values of which the daily total solar radiation was maximum for a specific period. It was found that the optimum tilt angle changed between 0° and 61.1° throughout the year in Sukkur IBA University, Sindh Pakistan ( latitude = 27.7268 ° N, longitude = 68.8191 ° E). For calculating irradiance, optimal fixed (15 and 29.5 degrees) and variable tilt angles are used for every month of year 2019. The irradiance calculated at 15 degrees tilt angle is compared with the fixed angle of 29.5 and variable angles. It was found that optimal tilt angle for the region of Sukkur located in northern Pakistan is to be 29.5 degrees.
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Salam T. Hussain, Abadal. "Measuring PV Module Performance at Different Tilt Angles in Southern Iraq Based Simulation." International Journal of Engineering & Technology 7, no. 2.34 (June 8, 2018): 84. http://dx.doi.org/10.14419/ijet.v7i2.34.13918.

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This paper presented that how to calculate the tilt angles and solar irradiance on photovoltaic (PV) module in southern Iraq (latitude 30° N). The latitude and day number of the city is taken into account to calculate the tilt angle and solar irradiance by using a mathematical equation. The optimum tilt angles of PV module in southern Iraq are range from 38° to 84°. The yearly maximum total and average solar irradiance is needed to determine the optimum tilt angle of PV module. The result shows that 50° of tilt angle is the best performance of PV module in southern Iraq.
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Lin, Jing, Yuli Wang, Todd Ochs, Chaoshu Tang, Junbao Du, and Hongfang Jin. "Tilt angles and positive response of head-up tilt test in children with orthostatic intolerance." Cardiology in the Young 25, no. 1 (October 15, 2013): 76–80. http://dx.doi.org/10.1017/s1047951113001601.

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AbstractThis study aimed at examining three tilt angle-based positive responses and the time to positive response in a head-up tilt test for children with orthostatic intolerance, and the psychological fear experienced at the three angles during head-up tilt test. A total of 174 children, including 76 boys and 98 girls, aged from 4 to 18 years old (mean 11.3±2.8 years old), with unexplained syncope, were randomly divided into three groups, to undergo head-up tilt test at the angles of 60°, 70° and 80°, respectively. The diagnostic rates and times were analysed, and Wong–Baker face pain rating scale was used to access the children’s psychological fear. There were no significant differences in diagnostic rates of postural orthostatic tachycardia syndrome and vasovagal syncope at different tilt angles during the head-up tilt test (p>0.05). There was a significant difference, however, in the psychological fear at different tilt angles utilising the Kruskal–Wallis test (χ2=36.398, p<0.01). It was mildest at tilt angle 60° utilising the Kolmogorov–Smirnov test (p<0.01). A positive rank correlation was found between the psychological fear and the degree of tilt angle (rs=0.445, p<0.01). Positive response appearance time was 15.1±14.0 minutes at 60° for vasovagal syncope children. There was no significant difference in the time to positive response, at different tilt angles during the head-up tilt test for vasovagal syncope or for postural orthostatic tachycardia syndrome. Hence, it is suggested that a tilt angle of 60° and head-up tilt test time of 45 minutes should be suitable for children with vasovagal syncope.
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Dissertations / Theses on the topic "Angle de tilt"

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Claudio, Gianfranco. "The effect of tilt angle on ion implanted profiles in silicon." Thesis, University of Surrey, 2004. http://epubs.surrey.ac.uk/843591/.

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This thesis reports a study, of the atomical and electrical properties, as function of tilt angle for VLSI technology in silicon. The ion species investigated have been arsenic, antimony and boron. Particular attention has been given to the dose loss and electrical activation as a function of the tilt angle in relation to the annealing conditions and the nature of the samples (crystalline or pre-amorphised). All the wafers have been implanted on the new SWIFT single wafer implanter realised by Applied Materials. Thermawave (TW) measurements performed on all samples implanted with As, B, and Sb show high uniformity of the dose implanted (less than 0.5%) on pre-amoiphised (a-Si) and crystalline silicon (c-Si). Rutherford backscattering spectrometry (RBS) has been performed in order to characterise the absolute dosimetry of the SWIFT implanter. Results obtained by RBS with an error of 1.4% have found no significant error in the implanter dosimetry. RBS measurements have also been performed to measure the retained dose for all samples before and after annealing for all the tilt angles investigated. Secondary Ion Mass Spectroscopy (SIMS) has been performed on antimony and boron implanted samples to measure the atomic profile as a function of depth in order to quantify the retained dose, the projected range, the straggle, the peak concentration and the junction depth. Hall measurements have been conducted to study the sheet resistance (Rs), Hall mobility (?H) and sheet earner concentration (Ns) as a function of the tilt angle for all the annealing conditions. Results show that Rs and Ns are functions of the tilt angle whilst ?H is independent of the tilt angle. Pre-amorphised wafers with germanium have also shown a better electrical activation (5%) and a lower junction depth (20-50 nm) compared to the crystalline ones for all the implanted samples. Differential Hall Measurements (DHM) have been performed on some samples for each ion species for particular tilt angles in order to evaluate any diffusion of the dopant for different annealing temperatures and compared with SIMS profiles. Comparison between simulated and experimental data has shown a good agreement only for the as implanted profiles. Computer simulation software is not able to give accurate annealed profiles due to the complex mechanism that involves defects and diffusion during annealing.
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Sano, Takahiro. "Biomechanics of Fixation of Distal Radius Fractures: Comparison between Volar Plate Fixator (VPF) and Non-Bridging External Fixator (NBX)." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_theses/121.

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Fracture of the distal radius is one of the most frequent injuries, and it represents about 20% of all adults taken into emergency rooms. A number of studies suggest various methods to reduce the dislocation and to secure fragments of the distal radius. In this study, the Non-Bridging External Wrist Fixator System (NBX), a pre-market-released product manufactured by NUTEK Inc. was biomechanically assessed by comparing with the Universal Distal Radius System (Volar Plate Fixator: VPF), a market-released product manufactured by Stryker Co. The comparison was performed in several parameters, which were wrist motion, radial tilt angle, radial length, volar tilt angle, stiffness, and failure load. Five pairs of fresh human cadaver arms were used for this study. The wrists were tested to obtain x-ray images for 1 normal and 2 injury conditions (intact, fractured, and fixed), 2 load conditions (gravity only and torque applied), and 4 postural conditions (volar flexion, dorsiflexion, ulnar deviation, and radial deviation). These tests yielded 24 (3×2×4) x-ray images for each wrist, and the images were analyzed to obtain the data for each parameter. Although the results were not statistically significant in some conditions, NBX fixation limited wrist motion more than VPF fixation. This result can be explained not only by the difference in the ability of fixation, but also by the difference in the surgical trauma (NBX is less invasive than VPF). Furthermore, in the measurement of radial tilt angle, radial length, and volar tilt angle, NBX was more effective than VPF to reduce and secure the bone fragments of the distal radius. In destructive test, the NBX is less strong than VPF. However, NBX is strong enough to sustain the expected forces of daily activity.
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Dock, Melissa. "Influence of pedometer tilt angle on step counting validity during controlled treadmill walking trials." Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/2008/dock/DockM0508.pdf.

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Pedometers are tools frequently used to monitor walking-related physical activity patterns of overweight and obese populations. However, there is a known association between increasing body mass index (BMI) and decreasing pedometer accuracy. The decrease in pedometer accuracy has been attributed to tilt angle, but the specific tilt angle where pedometers fail to maintain accuracy is unclear. PURPOSE: The purpose of this study was to test two popular pedometer mechanisms, accelerometry- and pendulum-based, to determine the specific tilt angle where the pedometers fail to maintain step counts accurately. METHODS: Twenty subjects (10 men, Mean±SD: 25.4±4.2 yrs, 184.4±5.3 cm, 76.7±6.3 kg; 10 women: 21.6±3 yrs, 166.1±6.3 cm, 56.7±6.7 kg) walked two sets of 21 trials at a combination of treadmill speed (67.0, 80.4, 93.8 m/min) and tilt angle (-30,-20,-10, 0,+10,+20,+30°) while wearing two pedometers; the experimental pedometer attached to a custom-built pedometer gimbal for altering tilt angle, and the control pedometer in a neutral position (±2° of 0°). The pedometers were worn on each hip just anterior to the iliac crest in line with the mid-axillary line of the thigh. The first set of trials tested one pedometer mechanism, while the second set of trials tested the second pedometer mechanism in a counterbalanced order. Mean steps from the experimental pedometer were compared to the control pedometer for each trial (ΔStep=Experimental-Control) using a 3-factor RMANOVA at an alpha level of 0.05. RESULTS: Mean Δsteps for the accelerometry-based pedometer and the pendulum-based pedometer differed significantly (P<0.05) at tilt angles >±10° for treadmill speeds 0° (-30, -20, -10, +10, +20, +30°, respectively). CONCLUSIONS: Increasing tilt angle caused a decrease in pedometer accuracy for both pedometer mechanisms, although the accelerometry-based pedometers were less affected. Negative tilt angles had less effect on pedometer accuracy than positive tilt angles, and the combination of increasing positive tilt angle and slower speeds had the greatest impact on step count accuracy.
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Hopkins, Jonathan B. (Jonathan Brigham). "The effect of probe tilt angle on the quality of scanning tunneling microscope measurements." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32888.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.
Includes bibliographical references (p. 39 ).
The effect of probe tilt angle on the quality of Scanning Tunneling Microscopy (STM) measurements was explored. A small but consistent improvement in slope accuracy was documented lending some support to the effort to develop a new, five-axis STM capable of tilting in a controlled manner while scanning. The objective of such a machine would be to allow its probe to trace the sample's contour with greater accuracy than the currently available three-axis STM can. It is postulated that an STM with a probe that can change its roll and pitch in addition to its position along the traditional x, y, and z axes would be capable of reducing imaging errors produced as a result of geometric constraints, lateral electron discharge effects, and the tendency for the tip to bend during scanning due to electrostatic surface forces. In order to quantify the effects of incorporating probe tilt into the scanning process, a traditional, three-axis STM was manipulated in a way that allowed a standard sample grid to be imaged using a probe that was placed at seven different angles of tilt ranging from -13 to +13 degrees. Twenty-five different cavities in a standard STM scanning sample were scanned at these seven angles to determine notable trends and effects in the images produced.
(cont.) It was determined that for each degree of angle change in the tilt of the probe, the slopes of the cavity walls imaged improved by an amount of slope equal to approximately 0.001 nm/nm, which corresponds to 0.0093% less imaging error. This seemingly trivial improvement in wall slope is significant in light of the fact that the change in slope per degree of probe tilt is on the same order of magnitude as the slopes of the cavity walls measured by the STM.
by Jonathan B. Hopkins.
S.B.
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TORRES, DIEGO FERNANDO CELIS. "NUMERICAL STUDY OF THE INFLUENCE OF TILT VALVE ANGLE ON BLOOD FLOW IN AN AORTIC MODEL." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=32320@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
A substituição de válvula aórtica por cateter (Transcatheter Aortic Valve Replacement, TAVR) tornou-se uma poderosa alternativa para pacientes com estenose aórtica e com alto risco de serem submetidos à cirurgia tradicional de peito aberto. O conhecimento da distribuição da pressão, bem como a tensão cisalhante na superfície da aorta podem ajudar a identificar regiões críticas, onde o processo de remodelamento da aorta pode ocorrer. O objetivo do presente trabalho é avaliar numericamente a influência do posicionamento do orifício da válvula protética no campo de escoamento. O estudo foi realizado com base em um paciente submetido a TAVR. Um modelo 3D foi gerado a partir de angiotomografia e de segmentação de imagens da aorta. Dados experimentais obtidos anteriormente na mesma geometria indicaram que o fluxo do jato através da válvula de entrada é de natureza turbulenta. O escoamento foi determinado numericamente com o software comercial FLUENT. A turbulência foi modelada com o modelo de dois equações k-omega SST. Para representar um fluxo pulsátil, foram impostos diferentes fluxo de massa na entrada da válvula. Para todas as vazões investigadas, obteve-se um padrão de escoamento semelhante. Mostrou-se que uma pequena variação dos ângulos de inclinação pode modificar a natureza do fluxo, deslocando a posição dos vórtices e alterando a localização das regiões de alta tensão de cisalhamento, assim como de alta pressão, na superfície interna da aorta. Mostrou-se também que um aumento da intensidade da turbulência na entrada diminui os valores de tensão cisalhante e de pressão nas paredes da aorta. Essas características hemodinâmicas podem ser relevantes no processo de remodelação aórtica e os estresses mecânicos podem influenciar na durabilidade da prótese valvular.
Transcatheter Aortic Valve Replacement (TAVR) has become a powerful alternative for patients with aortic stenosis and a high surgical risk to face a traditional open chest surgery. The knowledge of the pressure distribution as well as shear stress at the aortic surface may help identify critical regions, where aortic remodeling process may occur. The purpose of the present work is to evaluate numerically the influence of the positioning of the prosthetic valve orifice in the flow field. The study was carried out on the basis of a particular patient who had undergone a TAVR. A 3D model was generated from computed tomography angiography and image segmentation of the aorta. Experimental data previously obtained in the same geometry indicated that the jet flow through the inlet valve is turbulent flow. The flow field was numerically determined with the commercial software Fluent. The turbulence was modeled with the two-equation k-omega SST model. To represent a pulsatile flow, different mass flow rates were imposed at the inlet valve. Similar flow pattern was observed for all flow rates investigated. It was shown that small variations of the tilt angle can modify the nature of the flow, displacing the position of the vortices and altering the location of high shear stress, as well as high pressure, at the aortic inner wall. It was also shown that an increase of the turbulent intensity at the entrance decreases the values of shear stress and pressure on the walls. These hemodynamic features may be relevant in the aortic remodeling process and the mechanical stresses may influence the durability of the valve prosthesis.
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Alsulaiman, Mohamad, and Najmeh Mohammadi. "Optimal Pitch Distance and Tilt Angleof PV Power Plant for Different Climate." Thesis, Högskolan Dalarna, Energiteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:du-35528.

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Finding the optimum inter-row spacing and installation tilt for tilted or ground mounted PV systems is a big issue in designing the large-scale PV systems. Increasing the array spacing leads to higher annual generated energy because of the reduced impact of row-shading, but on the other hand, it increases costs of land purchase/lease and wiring costs. Many compromises between performance and cost should be done to design an optimum large-scaled solar plant. One of the criteria in designing of solar power plants is reducing of LCOE, which reflects the cost of every unit of generated energy. Site locations have large impacts on the optimal design of pitch distance and title angles, but such impacts have not been studied extensively in the existing studies, so it is going to bridge this research gap in this thesis.   The main purpose of this research is to investigate the impact of climate conditions on the pitch distance and tilt angle for large-scale PV plant and finding the optimal pitch distance and tilt according to the least cost of production. The impact of climate and meteorological data on the self-shading loss and yield of energy are investigated through a simulation tool, which is PVsyst software here, in different tilt angles and distances between rows. The different climates can be considered by choosing site locations in different latitudes to cover all climate zones. Six cities in temperate climate, three cities in tropic climate and one city in polar climate have been selected. LCOE minimizing is a measure in finding the optimum tilt and pitch distance for a 1 MW solar system installed in different latitudes. In this study the type, size and cost of components have been assumed constant in different climate conditions. There is a wide range of variability in some economic indicators like interest rate and discount rate as well as the cost of land in different climates or even countries in the same climate; then to highlight the impacts of climate conditions on the optimal tilt and pitch distance, these parameters were assumed to be constant in this study.   The results show the optimal tilt of angles increases with getting far of equator in a range between 0° and 40° to capture more direct sunlight, and the optimal raw spacing grows in further locations to equator in a range between 4 m to 11 m to reduce self- shading loss. Moreover, the best module configuration for PV arrays (portrait or landscape) can be different in different climates.
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Pellegrene, Brittany Ann. "Optimization of Transition Temperatures and Tilt Angle in SmCPA Phase Bent-Core Liquid Crystals." Kent State University Honors College / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1430258781.

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Gugale, Gaurav Subhash. "Development of Analytical Equations for Optimum Tilt of Two-Axis and Single-Axis Rotating Solar Panels for Clear-Atmosphere Condition." Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright148459939571045.

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Matsfelt, Johanna. "Study on the influence of the electrode tilt angle in GTAW doing CFD simulation of the heat source." Thesis, Högskolan Väst, Avd för maskinteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-5801.

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Alhaidari, Salah. "A Look at the Optimum Slope of a Fixed Solar Panel for Maximum Energy Collection for a One Year Time Frame." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1515545054060599.

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Books on the topic "Angle de tilt"

1

Wong, Douglas T. Evaluation of electrolytic tilt sensors for measuring model angle of attack in wind tunnel tests. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992.

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Anthony, Powell J., and United States. National Aeronautics and Space Administration., eds. Effect of tilt angle on the morphology of SiC epitaxial films grown on vicinal (0001)SiC substrates. [Washington, D.C: National Aeronautics and Space Administration, 1996.

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Till the dark angel comes: Abolitionism and the road to the second American Revolution. Yardley, Pennsylvania: Westholme Publishing, 2015.

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Britain and the Holocaust: The failure of Anglo-Jewish leadership? Portland, Or: Sussex Academic Press, 1999.

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Economic Optimization of PV Array Tilt Angle. academia.edu, 2017.

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Optimization of PV Panels Spacing. academia.edu, 2017.

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Gerrard, Christopher, and José Avelino Gutiérrez-González. Looking South. Edited by Christopher Gerrard and Alejandra Gutiérrez. Oxford University Press, 2018. http://dx.doi.org/10.1093/oxfordhb/9780198744719.013.42.

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This chapter explores medieval contact and trade between Britain and the Iberian Peninsula. For the pilgrimage to Santiago de Compostela in north-west Spain, archaeological evidence includes coins, burials, badges, scallop shells, and souvenirs of bone, ivory, and jet as well as artistic influences on heraldry and artistic representation. The important heavy goods being transported were wool, cloth, metals, and bulk foodstuffs for which there is an emerging archaeology of production in Spain and Portugal. There was also minor trade in leather and salt as well as in foodstuffs like honey and wine, figs, and candied fruit. Pottery and tile exports from Spain are today the most telling indication of commercial contact and personal exchange but English embroideries and alabaster devotional panels are among the items of exchange which travelled south and have survived. Overall, Anglo-Iberian contact in the Middle Ages has left an oddly skewed signature in the archaeological record.
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Dumas, Alexandre. The Count of Monte Cristo. Edited by David Coward. Oxford University Press, 2008. http://dx.doi.org/10.1093/owc/9780199219650.001.0001.

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‘People get out of prison, and when they get out, and their name is Edmond Dantès, they take their revenge!’ Falsely accused of treason, the young sailor Edmond Dantès is arrested on his wedding day and imprisoned in the island fortress of the Château d’If. Having endured years of incarceration, he stages a daring and dramatic escape and sets out to discover the fabulous treasure of Monte Cristo, and to catch up with his enemies. A novel of enormous tension and excitement, The Count of Monte Cristo is also a tale of obsession and revenge. Believing himself to be an ‘Angel of Providence’, Dantès pursues his vengeance to the bitter end, only then realizing that he himself is a victim of fate. One of the great thrillers of all time, The Count of Monte Cristo has been adapted for film and television many times. This newly revised, unabridged translation is as unputdownable now as it was when the novel first appeared, and William Thackeray, enthralled, ‘began to read Monte Cristo at six one morning and never stopped till eleven at night’.
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C, Taylor W., and William Sampson. History of Ireland, from the Anglo-Norman Invasion till the Union of the Country with Great Britain; Volume 2. Creative Media Partners, LLC, 2018.

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C, Taylor W. History of the Civil Wars of Ireland: From the Anglo-Norman Invasion, till the Union of the Country with Great Britain. HardPress, 2020.

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Book chapters on the topic "Angle de tilt"

1

Hernández-Guzmán, Victor Manuel, Ramón Silva-Ortigoza, and Jorge Alberto Orrante-Sakanassi. "Tilt Angle Estimation." In Automatic Control with Experiments, 773–88. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-55960-0_13.

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Song, Wenqin, Zhen Han, Kangli Zeng, and Zhongyuan Wang. "Multi-frame Tilt-angle Face Recognition Using Fusion Re-ranking." In Artificial Neural Networks and Machine Learning – ICANN 2023, 495–507. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-44210-0_40.

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Alexandrov, Vadim, Ilya Rezkov, Dmitrii Shatov, and Yury Morozov. "Identification of the Quadcopter Rotational Dynamics for the Tilt Angle." In Lecture Notes in Computer Science, 334–44. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-43111-1_30.

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Hu, Huimin, Yahui Bai, Chaoyi Zhao, Yinxia Li, Na Lin, and Zhongting Wang. "Investigation on the Correlation Model Between Display Height and Tilt Angle." In Design, User Experience, and Usability: Users, Contexts and Case Studies, 648–56. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91806-8_50.

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McArdle, Ciaran B., and John Woods. "Modified cyanoacrylate films for high tilt angle alignment of liquid crystals." In Polymer Surfaces and Interfaces: Characterization, Modification and Application, 225–38. London: CRC Press, 2023. http://dx.doi.org/10.1201/9780429070297-18.

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Fan, Xianlai, Yanfeng Li, Junmei Li, Yang Tian, Yunhan Liu, Huiqiang Liu, and Shouchong Zhao. "Study on the Angle of Flame Tilt under Longitudinal Ventilation in Tunnel." In Environmental Science and Engineering, 1017–25. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-13-9520-8_105.

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Iliceto, A., A. Previ, G. Chimento, and S. Guastella. "Determination of Optimum Tilt Angle of Panels in Large Scale Photovoltaic Arrays." In Tenth E.C. Photovoltaic Solar Energy Conference, 1244–47. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3622-8_314.

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Yadav, Amit Kumar, and Hasmat Malik. "Optimization of Tilt Angle for Intercepting Maximum Solar Radiation for Power Generation." In Studies in Systems, Decision and Control, 195–213. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34050-6_9.

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Arutyunov, Sergey D., Dmitry I. Grachev, Grigoriy G. Bagdasaryan, Ilia S. Nikitin, and Alexander D. Nikitin. "Numerical Study on the Teeth Installation Parameters: Shift and Tilt Angle Effects." In Applied Mathematics and Computational Mechanics for Smart Applications, 185–96. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4826-4_14.

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Jacques, Alain, Elisabeth Marlière, Jean-Pierre Michel, and Amand George. "Crossing of High Angle Symmetric Tilt Coincidence Boundaries by Dislocations in Silicon." In Dislocations in Solids, 655–58. London: CRC Press, 2023. http://dx.doi.org/10.1201/9780429070914-158.

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Conference papers on the topic "Angle de tilt"

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Yamaguchi, Tetsuji, Akira Yamada, Takeshi Fujiwara, Ryoichi Takahashi, Tetsuya Shimada, Yuki Ishida, Koichiro Ueda, and Shigeo Kaneda. "Development of Bicycle Simulator with Tilt Angle Control Tilt Angle." In 2018 IEEE 42nd Annual Computer Software and Applications Conference (COMPSAC). IEEE, 2018. http://dx.doi.org/10.1109/compsac.2018.10238.

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Huang, Hua. "Design of tilt angle measurement system." In 2012 2nd International Conference on Applied Robotics for the Power Industry (CARPI 2012). IEEE, 2012. http://dx.doi.org/10.1109/carpi.2012.6356378.

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Dogaheh, Z. Rasouli, and V. Puig. "Tilt Angle Optimization of Photovoltaic Panels." In 2019 6th International Conference on Control, Decision and Information Technologies (CoDIT). IEEE, 2019. http://dx.doi.org/10.1109/codit.2019.8820549.

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Cooper, G. R. J. "Edge Enhancement Using the Tilt Angle." In 68th EAGE Conference and Exhibition incorporating SPE EUROPEC 2006. European Association of Geoscientists & Engineers, 2006. http://dx.doi.org/10.3997/2214-4609.201402093.

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Savithri, C. N., Nandhini R, Harini R, and Lekha C. "Tilt Angle Determination for Solar Tracker." In 2023 Intelligent Computing and Control for Engineering and Business Systems (ICCEBS). IEEE, 2023. http://dx.doi.org/10.1109/iccebs58601.2023.10448776.

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Alhamer, Essa, Addison Grigsby, and Rydge Mulford. "Optimal Bi-Annual Tilt Angles and Optimal Tilt Transition Timing for Fixed Tilt Arrays in the United States." In ASME 2022 16th International Conference on Energy Sustainability collocated with the ASME 2022 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/es2022-84344.

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Abstract As global dependency on renewable energy grows, it is imperative to utilize every Photovoltaic (PV) panel in the most efficient way possible. An important consideration for increasing PV panel energy production is to carefully select the tilt angle relative to the ground of the installed panel. Tracking arrays resolve this issue by dynamically tracking the sun throughout the course of the day, but tracking technology includes additional capital costs and is not affordable for residential systems. The goals of this study are to explore the use of a bi-annual fixed tilt array, where the tilt angle of the fixed array is changed at two times in the year to better capture the seasonal variation in solar irradiation. The goal of this study is to use optimization techniques to resolve the ideal tilt angles as well as the optimal time to change between these two angles for every state in the continental United States. Biannual arrays are then compared to fixed tilt and 1D tracking arrays while examining local weather variations and their effect on the optimal PV tilt angle and solar PV production. In general, PV panels with a fixed tilt in states at higher latitudes collect 90% of the energy that a 1D tracking array would collect, whereas bi-annual tilt angle array produce on average 97% of the energy that a 1D tracking array collects, making the bi-annual tilt method nearly as effective as 1D tracking at these latitudes. Fixed tilt arrays in the southern United States collect on average 85% of the energy that a 1D tracking array would collect, whereas bi-annual tilt arrays in the southern United States produce at maximum 90% of the energy that a 1D tracking array produces. Nearly all states optimize energy production when the tilt angle is changed during the month of March and the month of August. This paper also examines the relationship between summer and winter temperatures and cloud cover, and their effect on optimal tilt and overall PV performance.
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Naraghi, Mohammad H. "Optimum Solar Panel Tilt Angle for Maximum Annual Irradiation." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-13018.

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This work presents a simple numerical model, based on a spreadsheet, to optimize solar panel tilt angle for given panel azimuth angle. This approach uses ASHRAE’s solar irradiation model, which presents a comprehensive model for calculating solar irradiation based on direct, reflected, diffuse and scattered components of solar irradiation. It includes the atmospheric extinction coefficient and sky clearness number (index). By calculating the monthly total irradiation from January to December the present model calculates the total annual irradiation on an incline solar panel. Then by implementing spreadsheet’s solver, the tilt angle to yield maximum annual solar irradiation per square area of panel is evaluated. Due to its general formulation the present model can be used to optimize solar tilt angle for any location (latitude) as long as the clearness index and ground reflectivity are known. The results of this model were compared with some existing location specific optimum tilt angles. The results are comparable within three degrees of tilt angle.
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Nakano, Hisamatsu, Yuhei Kameta, and Junji Yamauchi. "Radiation beam with a large tilt angle." In 2016 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC. IEEE, 2016. http://dx.doi.org/10.1109/apwc.2016.7738104.

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Lee, Chang Hwa, and Seung S. Lee. "Capacitive Tilt Sensor Using Metallic Ball." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10938.

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A new capacitive type of tilt sensor using metallic ball is proposed primarily to get over the contact problem in measurement of tilt angle. Its structure and fabrication process are simpler than other previous sensors. Capacitive sensing type has many advantages such as simplicity, non-contact measurement of angle, long-throw linear displacement, and sub-micron plate spacing comparing to other types. The dimension of this prototype sensor is 20mm × 20mm and the diameter of the polystyrene tube is 5mm and the thickness of the tube is 0.15mm. The test result shows the linear relationship between tilt angles and capacitances.
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Ashhab, Moh'd Sami, and Omar Akash. "Experiment on PV panels tilt angle and dust." In 2016 5th International Conference on Electronic Devices, Systems and Applications (ICEDSA). IEEE, 2016. http://dx.doi.org/10.1109/icedsa.2016.7818490.

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Reports on the topic "Angle de tilt"

1

Kiss, F., and V. Tschirhart. Tilt angle of the magnetic field, aeromagnetic survey of the Marguerite River area, Saskatchewan, parts of NTS 74-F south. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/302758.

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Kiss, F., and V. Tschirhart. Tilt angle of the magnetic field, aeromagnetic survey of the Marguerite River area, Saskatchewan, parts of NTS 74-F north. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/302759.

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Kiss, F., and V. Tschirhart. Tilt angle of the magnetic field, aeromagnetic survey of the Marguerite River area, Saskatchewan, parts of NTS 74-K south. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/302760.

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Kiss, F., and V. Tschirhart. Tilt angle of the magnetic field, aeromagnetic survey of the Marguerite River area, Alberta, parts of NTS 74-L north and 74-L south. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/302756.

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Kiss, F., and V. Tschirhart. Tilt angle of the magnetic field, aeromagnetic survey of the Marguerite River area, Alberta, parts of NTS 74-E north and 74-E south. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/302757.

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Oneschuk, D., and G. Kilfoil. Tilt angle of the magnetic field, airborne geophysical data compilation, north-central Newfoundland, Newfoundland and Labrador, parts of NTS 2-C, D, E and F. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/329229.

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Nafakh, Abdullah Jalal, Franklin Vargas Davila, Yunchang Zhang, Jon D. Fricker, and Dulcy M. Abraham. Workzone Lighting and Glare on Nighttime Construction and Maintenance Activities. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317379.

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Over the last two decades, an increasing number of highway construction and maintenance projects in the United States have been completed at night to avoid or alleviate traffic congestion delays. Working at night entails several advantages, including lower traffic volumes, less impact on local businesses, cooler temperatures for equipment and material, and fewer overall crashes. Although nighttime roadway operations may minimize traffic disruptions, there are several safety concerns about passing motorists and workers in the nighttime work zone. For instance, improper lighting arrangements or excessive lighting levels at the job site could cause harmful levels of glare for the traveling public and workers, which can lead to an increased level of hazards and crashes in the vicinity of the work zone. To address the issue of glare, the current report focuses on determining and evaluating disability glare on nighttime work zones in order to develop appropriate strategies for improving the safety of workers and motorists during nighttime highway construction and maintenance projects. Disability glare is the glare that impairs our vision of objects without necessarily causing discomfort, and it can be evaluated using the veiling luminance ratio (VL ratio). In this study, disability glare values were determined by using lighting data (vertical illuminance and pavement luminance measurements) from the testing of 49 lighting arrangements. Two LED balloon lights, a metal-halide light tower, and an LED light tower were utilized for the field lighting experiments. The glare assessment analyzed the effects of the lighting system setup’s parameters, such as the mounting height, power output, rotation angle, and aiming angle of luminaires on the veiling luminance ratio values (which is a criterion for limiting disability glare). The study revealed the following key findings: (1) an increase in mounting heights of both balloon lights and light towers resulted in lower disability glare levels; (2) compared to the "perpendicular" and "away" orientations, orienting the light towers "towards" the traffic (45 degrees) significantly increases the disability glare levels of the lighting arrangement; and (3) increasing the tilt angles of portable light tower luminaries resulted in an increase in disability glare levels.
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Oneschuk, D., and G. Kilfoil. Tilt angle of the magnetic field, characterization of a highly prospective fault system with airborne geophysics data, west-central Newfoundland, Newfoundland and Labrador, NTS 12-A and parts of NTS 1-M, 2-D, 11-O, P and 12-B. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328204.

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